Production of Rhenium in the Form of Ammonium Perrhenate from Anthropogenic Waste of Copper Production
Abstract
Rhenium was isolated in form of high purity ammonium perrhenate from technogenic waste of copper production. Obtaining scheme of high quality ammonium perrhenate from lead sludge includes first the stage of oxidative burning to burn out organic impurities, at a temperature of 550-650 oC, for 4-6 hours and obtaining cinder without organics, sulfur and other volatile impurities, then leaching cinder at temperature 80-90 oC, ratio of liquid to solid=1:(4-5), the presence of oxidant hydrogen peroxide, up to 83% of rhenium passed in productive solution. Rhenium sorption from the obtained solutions was carried out on ion-exchange unit consisting of two columns with a fixed layer of resin-Purolite A170. The sorption process is finished at the content of rhenium in the mother liquors not more than 20 mg/L. The resin contains rhenium14.5 kg/t. After saturating the ionites with rhenium and washing with water, desorption of the absorbed rhenium with a solution of 8% ammonia water was carried out. After evaporation, the rhenium-enriched eluate enters the crystalliser for the last stage. After one stage of recrystallisation of rough ammonium perrhenate, a pilot batch of ammonium perrhenate containing 69.32% of rhenium and corresponding to AR-00 grade in terms of impurity content was obtained.